On Tue, Jan 16, 2018 at 9:33 PM, <ahwhit...@gmail.com> wrote: > I am connecting 2 bb blacks via serial uart, /dev/ttyO1. or /dev/ttyS1. they > are symlinked. I need to use them at the fastest speeds, i.e. B3000000 or > more. When i use the older 7.11 image (straight off beagleboard downloads > site), the BB's communicate rock solid, no losses. When i upgrade the image > to the current 9.1, the non-IoT image, and use the same code and the same > HW, i can't get reliable data xfer'd across the serial link. A lot of errors > in comparison to the almost none using the old image. It finally was working > reliably at B500000. > > My dilemma is i don't want to remain with effectively an obsolete image > (i.e.. debian 7.11). It makes everything else harder to keep up. I've played > with uEnv.txt options. Nothing seems to matter. > > I didn't find any thread in the forum discussing this kind of problem. > Clearly something is different about 9.1 and the serial subsystem from the > earlier 7.11 version. I was having same problem with latest version 8 as > well. > > has anyone experienced this, and better, found a fix. Driver, device tree > configuration, whatever.
You can install the old "3.8.x" based kernel in 9.x or 8.x via: cd /opt/scripts/tools/ git pull sudo ./update_kernel.sh --bone-channel --stable sudo reboot BTW, newer images us U-Boot Overlays, so remember to double check /boot/uEnv.txt and "disable it": from: enable_uboot_overlays=1 to: #enable_uboot_overlays=1 Then you can verify if it's a kernel or new lib issue.. Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYjFoU8wbJC2o%2B58N3yXNTXhtgRgV6RuYuEUnRxfE2DqQA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
